Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-03-24
Phys.Lett.B664:41-46,2008
Physics
High Energy Physics
High Energy Physics - Experiment
Submitted to Phys. Lett. B
Scientific paper
10.1016/j.physletb.2008.05.006
The MiniBooNE experiment at Fermilab has amassed the largest sample to date of $\pi^0$s produced in neutral current (NC) neutrino-nucleus interactions at low energy. This paper reports a measurement of the momentum distribution of $\pi^0$s produced in mineral oil (CH$_2$) and the first observation of coherent $\pi^0$ production below 2 GeV. In the forward direction, the yield of events observed above the expectation for resonant production is attributed primarily to coherent production off carbon, but may also include a small contribution from diffractive production on hydrogen. Integrated over the MiniBooNE neutrino flux, the sum of the NC coherent and diffractive modes is found to be (19.5 $\pm$1.1 (stat) $\pm$2.5 (sys))% of all exclusive NC $\pi^0$ production at MiniBooNE. These measurements are of immediate utility because they quantify an important background to MiniBooNE's search for $\nu_{\mu} \to \nu_e$ oscillations.
Aguilar-Arevalo Alexis A.
Anderson Ernest C.
Bazarko Andrew O.
Brice S. J.
Brown Bruce C.
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